The TTL / MSI SN54 / 74LS151 is a high speed 8-input Digital Multiplexer.

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8-INPUT MULTIPLEXER

The TTL / MSI SN54 / 74LS151 is a high speed 8-input Digital Multiplexer.

It provides, in one package, the ability to select one bit of data from up to eight sources. The LS151 can be used as a universal function generator to generate any logic function of four variables. Both assertion and negation outputs are provided.

• Schottky Process for High Speed

• Multifunction Capability

• On-Chip Select Logic Decoding

• Fully Buffered Complementary Outputs

• Input Clamp Diodes Limit High Speed Termination Effects

CONNECTION DIAGRAM DIP (TOP VIEW)

PIN NAMES LOADING (Note a)

HIGH LOW

S0 – S2 E I0 – I7 Z Z

Select Inputs

Enable (Active LOW) Input Multiplexer Inputs Multiplexer Output (Note b) Complementary Multiplexer Output

(Note b)

0.5 U.L.

10 U.L.

0.25 U.L.

5 (2.5) U.L.

NOTES:

a) 1 TTL Unit Load (U.L.) = 40 µA HIGH/1.6 mA LOW.

b) The Output LOW drive factor is 2.5 U.L. for Military (54) and 5 U.L. for Commercial (74) Temperature Ranges.

SN54/74LS151

8-INPUT MULTIPLEXER LOW POWER SCHOTTKY

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LOGIC SYMBOL

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FAST AND LS TTL DATA

SN54/74LS151

LOGIC DIAGRAM

FUNCTIONAL DESCRIPTION

The LS151 is a logical implementation of a single pole, 8-position switch with the switch position controlled by the state of three Select inputs, S0, S1, S2. Both assertion and negation outputs are provided. The Enable input (E) is active LOW. When it is not activated, the negation output is HIGH and the assertion output is LOW regardless of all other inputs.

The logic function provided at the output is:

Z = E ⋅ (I0 ⋅ S0 ⋅ S1 ⋅ S2 + ⋅ I1 ⋅ S0 ⋅ S1 ⋅ S2 + I2 ⋅ S0 ⋅ S1 ⋅ S2 + I3 ⋅ S0 ⋅ S1 ⋅ S2 + I4 ⋅ S0 ⋅ S1 ⋅ S2 + I5 ⋅ S0 ⋅ S1 ⋅ S2 + I6 ⋅ S0

⋅ S1 ⋅ S2 + I7 ⋅ S0 ⋅ S1 ⋅ S2).

The LS151 provides the ability, in one package, to select from eight sources of data or control information. By proper manipulation of the inputs, the LS151 can provide any logic function of four variables and its negation.

TRUTH TABLE

E S2 S1 S0 I0 I1 I2 I3 I4 I5 I6 I7 Z Z

H X X X X X X X X X X X H L

L L L L L X X X X X X X H L

L L L L H X X X X X X X L H

L L L H X L X X X X X X H L

L L L H X H X X X X X X L H

L L H L X X L X X X X X H L

L L H L X X H X X X X X L H

L L H H X X X L X X X X H L

L L H H X X X H X X X X L H

L H L L X X X X L X X X H L

L H L L X X X X H X X X L H

L H L H X X X X X L X X H L

L H L H X X X X X H X X L H

L H H L X X X X X X L X H L

L H H L X X X X X X H X L H

L H H H X X X X X X X L H L

L H H H X X X X X X X H L H

H = HIGH Voltage Level L = LOW Voltage Level X = Don’t Care

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SN54/74LS151

GUARANTEED OPERATING RANGES

Symbol Parameter Min Typ Max Unit

VCC Supply Voltage 54

74 4.5 4.75

5.0 5.0

5.5 5.25

V

TA Operating Ambient Temperature Range 54

74 – 55 0

25 25

125 70

°

C

IOH Output Current — High 54, 74 – 0.4 mA

IOL Output Current — Low 54

74 4.0 8.0

mA

DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)

Symbol Parameter

Limits

Unit Test Conditions

Symbol Parameter Min Typ Max Unit Test Conditions

VIH Input HIGH Voltage 2.0 V Guaranteed Input HIGH Voltage for

All Inputs

VIL Input LOW Voltage 54 0.7

V Guaranteed Input LOW Voltage for VIL Input LOW Voltage

74 0.8 V Guaranteed Input LOW Voltage for

All Inputs

VIK Input Clamp Diode Voltage – 0.65 – 1.5 V VCC = MIN, IIN = – 18 mA

VOH Output HIGH Voltage 54 2.5 3.5 V VCC = MIN, IOH = MAX, VIN = VIH

or VIL per Truth Table VOH Output HIGH Voltage

74 2.7 3.5 V

VCC = MIN, IOH = MAX, VIN = VIH or VIL per Truth Table

VOL Output LOW Voltage

54, 74 0.25 0.4 V IOL = 4.0 mA VCC = VCC MIN,

VIN = VIL or VIH per Truth Table VOL Output LOW Voltage

74 0.35 0.5 V IOL = 8.0 mA VIN = VIL or VIH

per Truth Table

IIH Input HIGH Current 20

µ

A VCC = MAX, VIN = 2.7 V

IIH Input HIGH Current

0.1 mA VCC = MAX, VIN = 7.0 V

IIL Input LOW Current – 0.4 mA VCC = MAX, VIN = 0.4 V

IOS Short Circuit Current (Note 1) – 20 – 100 mA VCC = MAX

ICC Power Supply Current 10 mA VCC = MAX

Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.

AC CHARACTERISTICS _{(TA = 25°} C)

Symbol Parameter

Limits

Unit Test Conditions

Symbol Parameter Min Typ Max Unit Test Conditions

tPLH tPHL

Propagation Delay Select to Output Z

27 18

43 30 ns

VCC = 5.0 V CL = 15 pF tPLH

tPHL

Propagation Delay Select to Output Z

14 20

23 32 ns

VCC = 5.0 V CL = 15 pF tPLH

tPHL

Propagation Delay Enable to Output Z

26 20

42 32 ns

VCC = 5.0 V CL = 15 pF tPLH

tPHL

Propagation Delay Enable to Output Z

15 18

24 30 ns

VCC = 5.0 V CL = 15 pF

tPLH tPHL

Propagation Delay Data to Output Z

20 16

32 26 ns

tPLH tPHL

Propagation Delay Data to Output Z

13 12

21 20 ns

AC WAVEFORMS

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FAST AND LS TTL DATA

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